which port on the vacuum valve mounted to the IP does the line running to the transmission connect to? also how does the little green pot connect and what does it do?

Use the top port. The green thing is a dampener. Put that directly on top of the top port. Then on top of the green dampener, mount a tee. One branch is your vacuum supply. The other goes to the trans modulator.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

What Pete said.

And, there should be an orifice (plastic piece with small hole inside) in the vacuum supply line to the VCV, before the green dampener.

1984 300d Turbo
You Can Buy The Line Onifice At Autozone Small Hole 1 In. Line Connector Works Good Diy

The Green tube is called a transmision dash pot and is a restrictor to meter the amount of vacuum sent to the transmission switch.

__________________
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

If the vacuum supply and transmission line both connect to the top port what goes to the bottom port? Does the green pot have a top or bottom?

1984 300d Turbo 136k
Use A Short Vac Hose To Top Of The Vacuum Valve To Green Dash Pot To A Hose Tee 3 Way One To Trans Line The Other To Vacuum Source I Replace The Vacuum Valve Now Have Good Shift Of Transmission, 0-15 In Out Check With Hand Vacuum Gage To Top Of Vacuum Valve Pump Ea Time After Move Of Full Power 0 In , Idle Position 10-15 In Engine Off Diy

Does this look right?
Where does the "mystery line" lead to?

I should probably add that this is AFTER eliminating the lines to and from the EGR. (Thanks BC.)

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The mystery line is a dump of the vacuum that is being bled off by the valve.

It is routed into the cockpit (is that the right word?) to avoid sucking up dirt and crap from the engine and getting blocked.

Here's a link to a good article on tranny and vacuum.

http://users.vnet.net/w123d/w123d/transmission.htm

Good thing. Read it a few times, I did.

Can you elaborate on this orifice. Where to get it , is it a special part? I looked for it at Advance. It is what drops the 25 hg from the supply line to 15hg that the tranny want no? Also, Diesel Giant says above the green dampner is supposed to throttle down the vacuum to the tranny, How does it do this if the supply, tranny, and green dampner are all on a 3 way. Is it just a matter of physics and the design of the green dampner? Maybe it can rob some vacuum from the tranny?

Thanks.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

It's probably a dealer item. It doesn't drop the vacuum level per se.........however, it reduces the flow from the transmission circuit. Then the VCV can leak properly and reduce the vacuum to the modulator. With full vacuum to the VCV, the "leak" in the VCV won't function properly.

The green dampener doesn't reduce the vacuum in any way........it just slows the response of the transmission circuit to sudden changes in vacuum........similar to a shock absorber in the circuit.